import {IAugmentedJQuery, IFilterService} from 'angular'

import moment, {MomentInput} from 'moment'

export type TimeFramesDisplayMode = 'visible' | 'cropped' | 'hidden'

export interface TimeFrameOptions {
  start?: moment.Moment
  end?: moment.Moment
  working?: boolean
  magnet?: boolean
  default?: boolean
  color?: string
  classes?: string[]
  internal?: boolean
}

/**
 * TimeFrame represents time frame in any day. parameters are given using options object.
 *
 * @param {moment|string} start start of timeFrame. If a string is given, it will be parsed as a moment.
 * @param {moment|string} end end of timeFrame. If a string is given, it will be parsed as a moment.
 * @param {boolean} working is this timeFrame flagged as working.
 * @param {boolean} magnet is this timeFrame will magnet.
 * @param {boolean} default is this timeFrame will be used as default.
 * @param {color} css color attached to this timeFrame.
 * @param {string} classes css classes attached to this timeFrame.
 *
 * @constructor
 */
export class TimeFrame implements TimeFrameOptions {
  start?: moment.Moment
  end?: moment.Moment
  working?: boolean
  magnet?: boolean
  default?: boolean
  color?: string
  classes?: string[]
  internal?: boolean

  left: number
  width: number
  hidden: boolean
  originalSize: { left: number; width: number }
  cropped: boolean

  $element: IAugmentedJQuery

  constructor (options: TimeFrameOptions) {
    if (options === undefined) {
      options = {}
    }

    this.start = options.start
    this.end = options.end
    this.working = options.working
    this.magnet = options.magnet !== undefined ? options.magnet : true
    this.default = options.default
    this.color = options.color
    this.classes = options.classes
    this.internal = options.internal
  }

  updateView () {
    if (this.$element) {
      let cssStyles = {}

      if (this.left !== undefined) {
        cssStyles['left'] = this.left + 'px'
      } else {
        cssStyles['left'] = ''
      }
      if (this.width !== undefined) {
        cssStyles['width'] = this.width + 'px'
      } else {
        cssStyles['width'] = ''
      }

      if (this.color !== undefined) {
        cssStyles['background-color'] = this.color
      } else {
        cssStyles['background-color'] = ''
      }

      this.$element.css(cssStyles)

      let classes = ['gantt-timeframe' + (this.working ? '' : '-non') + '-working']
      if (this.classes) {
        classes = classes.concat(this.classes)
      }
      // tslint:disable:one-variable-per-declaration
      for (let i = 0, l = classes.length; i < l; i++) {
        this.$element.toggleClass(classes[i], true)
      }
    }
  }

  getDuration () {
    if (this.end !== undefined && this.start !== undefined) {
      return this.end.diff(this.start, 'milliseconds')
    }
  }

  clone () {
    return new TimeFrame(this)
  }
}

export interface TimeFrameMappingFunction {(date: moment.Moment): string[]}

/**
 * TimeFrameMapping defines how timeFrames will be placed for each days. parameters are given using options object.
 *
 * @param {function} func a function with date parameter, that will be evaluated for each distinct day of the gantt.
 *                        this function must return an array of timeFrame names to apply.
 * @constructor
 */
export class TimeFrameMapping {
  private func: TimeFrameMappingFunction

  constructor (func: TimeFrameMappingFunction) {
    this.func = func
  }

  getTimeFrames (date: moment.Moment): string[] {
    let ret: string[] = this.func(date)
    if (!(ret instanceof Array)) {
      ret = [ret]
    }
    return ret
  }

  clone () {
    return new TimeFrameMapping(this.func)
  }
}

interface DateFrameOptions {
  evaluator: { (date: moment.Moment): boolean }
  date?: MomentInput
  start?: moment.Moment
  end?: moment.Moment
  default?: boolean
  targets: any
}

/**
 * A DateFrame is date range that will use a specific TimeFrameMapping, configured using a function (evaluator),
 * a date (date) or a date range (start, end). parameters are given using options object.
 *
 * @param {function} evaluator a function with date parameter, that will be evaluated for each distinct day of the gantt.
 *                   this function must return a boolean representing matching of this dateFrame or not.
 * @param {moment} date date of dateFrame.
 * @param {moment} start start of date frame.
 * @param {moment} end end of date frame.
 * @param {array} targets array of TimeFrameMappings/TimeFrames names to use for this date frame.
 * @param {boolean} default is this dateFrame will be used as default.
 * @constructor
 */
export class DateFrame {
  evaluator: { (date: moment.Moment): boolean }
  start: moment.Moment
  end: moment.Moment
  default: boolean
  targets: string[]

  constructor (options: DateFrameOptions) {
    this.evaluator = options.evaluator
    if (options.date) {
      this.start = moment(options.date).startOf('day')
      this.end = moment(options.date).endOf('day')
    } else {
      this.start = options.start
      this.end = options.end
    }
    if (options.targets instanceof Array) {
      this.targets = options.targets
    } else {
      this.targets = [options.targets]
    }
    this.default = options.default
  }

  dateMatch (date: moment.Moment) {
    if (this.evaluator) {
      return this.evaluator(date)
    } else if (this.start && this.end) {
      return date >= this.start && date <= this.end
    } else {
      return false
    }
  }

  clone () {
    return new DateFrame(this)
  }
}

/**
 * Register TimeFrame, TimeFrameMapping and DateMapping objects into Calendar object,
 * and use Calendar#getTimeFrames(date) function to retrieve effective timeFrames for a specific day.
 *
 * @constructor
 */
export class GanttCalendar {
  static $filter: IFilterService

  timeFrames: {[name: string]: TimeFrame} = {}
  timeFrameMappings: {[name: string]: TimeFrameMapping} = {}
  dateFrames: {[name: string]: DateFrame} = {}

  /**
   * Remove all objects.
   */
  clear () {
    this.timeFrames = {}
    this.timeFrameMappings = {}
    this.dateFrames = {}
  }

  /**
   * Register TimeFrame objects.
   *
   * @param {object} timeFrames with names of timeFrames for keys and TimeFrame objects for values.
   */
  registerTimeFrames (timeFrames: {[name: string]: TimeFrameOptions}) {
    for (let name in timeFrames) {
      let timeFrame = timeFrames[name]
      this.timeFrames[name] = new TimeFrame(timeFrame)
    }
  }

  /**
   * Removes TimeFrame objects.
   *
   * @param {array} timeFrames names of timeFrames to remove.
   */
  removeTimeFrames (timeFrames: string[]) {
    for (let name in timeFrames) {
      delete this.timeFrames[name]
    }
  }

  /**
   * Remove all TimeFrame objects.
   */
  clearTimeFrames () {
    this.timeFrames = {}
  }

  /**
   * Register TimeFrameMapping objects.
   *
   * @param {object} mappings object with names of timeFrames mappings for keys and TimeFrameMapping objects for values.
   */
  registerTimeFrameMappings (mappings: {(date: moment.Moment): TimeFrameMappingFunction}) {
    for (let name in mappings) {
      let timeFrameMapping = mappings[name]
      this.timeFrameMappings[name] = new TimeFrameMapping(timeFrameMapping)
    }
  }

  /**
   * Removes TimeFrameMapping objects.
   *
   * @param {array} mappings names of timeFrame mappings to remove.
   */
  removeTimeFrameMappings (mappings: string[]) {
    for (let name in mappings) {
      delete this.timeFrameMappings[name]
    }
  }

  /**
   * Removes all TimeFrameMapping objects.
   */
  clearTimeFrameMappings () {
    this.timeFrameMappings = {}
  }

  /**
   * Register DateFrame objects.
   *
   * @param {object} dateFrames object with names of dateFrames for keys and DateFrame objects for values.
   */
  registerDateFrames (dateFrames: {[name: string]: DateFrameOptions}) {
    for (let name in dateFrames) {
      let dateFrame = dateFrames[name]
      this.dateFrames[name] = new DateFrame(dateFrame)
    }
  }

  /**
   * Remove DateFrame objects.
   *
   * @param {array} dateFrames names of date frames to remove.
   */
  removeDateFrames (dateFrames: string[]) {
    for (let name in dateFrames) {
      delete this.dateFrames[name]
    }
  }

  /**
   * Removes all DateFrame objects.
   */
  clearDateFrames () {
    this.dateFrames = {}
  }

  filterDateFrames (inputDateFrames: {[name: string]: DateFrame}, date: moment.Moment): DateFrame[] {
    let dateFrames = []
    for (let name in inputDateFrames) {
      let dateFrame = inputDateFrames[name]
      if (dateFrame.dateMatch(date)) {
        dateFrames.push(dateFrame)
      }
    }
    if (dateFrames.length === 0) {
      for (let name in inputDateFrames) {
        let dateFrame = inputDateFrames[name]
        if (dateFrame.default) {
          dateFrames.push(dateFrame)
        }
      }
    }
    return dateFrames
  }

  /**
   * Retrieves TimeFrame objects for a given date, using whole configuration for this Calendar object.
   *
   * @param {moment} date
   *
   * @return {array} an array of TimeFrame objects.
   */
  getTimeFrames (date: moment.Moment): TimeFrame[] {
    let timeFrames: TimeFrame[] = []
    let dateFrames = this.filterDateFrames(this.dateFrames, date)

    for (let dateFrame of dateFrames) {
      if (dateFrame !== undefined) {
        let targets = dateFrame.targets

        for (let target of targets) {
          let timeFrameMapping = this.timeFrameMappings[target]
          if (timeFrameMapping !== undefined) {
            // If a timeFrame mapping is found
            let names = timeFrameMapping.getTimeFrames(date)
            for (let name of names) {
              let timeFrame = this.timeFrames[name]
              timeFrames.push(timeFrame)
            }
          } else {
            // If no timeFrame mapping is found, try using direct timeFrame
            let timeFrame = this.timeFrames[target]
            if (timeFrame !== undefined) {
              timeFrames.push(timeFrame)
            }
          }
        }
      }
    }

    let dateYear = date.year()
    let dateMonth = date.month()
    let dateDate = date.date()

    let validatedTimeFrames = []
    if (timeFrames.length === 0) {
      for (let name in this.timeFrames) {
        let timeFrame = this.timeFrames[name]
        if (timeFrame.default) {
          timeFrames.push(timeFrame)
        }
      }
    }

    for (let name in timeFrames) {
      let timeFrame = timeFrames[name]
      let cTimeFrame = timeFrame.clone()

      if (cTimeFrame.start !== undefined) {
        cTimeFrame.start.year(dateYear)
        cTimeFrame.start.month(dateMonth)
        cTimeFrame.start.date(dateDate)
      }

      if (cTimeFrame.end !== undefined) {
        cTimeFrame.end.year(dateYear)
        cTimeFrame.end.month(dateMonth)
        cTimeFrame.end.date(dateDate)

        if (moment(cTimeFrame.end).startOf('day') === cTimeFrame.end) {
          cTimeFrame.end.add(1, 'day')
        }
      }

      validatedTimeFrames.push(cTimeFrame)
    }

    return validatedTimeFrames
  }

  /**
   * Solve timeFrames.
   *
   * Smaller timeFrames have priority over larger one.
   *
   * @param {array} timeFrames Array of timeFrames to solve
   * @param {moment} startDate
   * @param {moment} endDate
   */
  solve (timeFrames: TimeFrame[], startDate, endDate) {
    let color: string
    let classes: string[]
    let minDate: moment.Moment
    let maxDate: moment.Moment

    for (let timeFrame of timeFrames) {
      if (minDate === undefined || minDate > timeFrame.start) {
        minDate = timeFrame.start
      }
      if (maxDate === undefined || maxDate < timeFrame.end) {
        maxDate = timeFrame.end
      }
      if (color === undefined && timeFrame.color) {
        color = timeFrame.color
      }
      if (timeFrame.classes !== undefined) {
        if (classes === undefined) {
          classes = []
        }
        classes = classes.concat(timeFrame.classes)
      }
    }

    if (startDate === undefined) {
      startDate = minDate
    }

    if (endDate === undefined) {
      endDate = maxDate
    }

    let solvedTimeFrames: TimeFrame[] = [new TimeFrame({start: startDate, end: endDate, internal: true})]

    timeFrames = GanttCalendar.$filter('filter')(timeFrames, (timeFrame) => {
      return (timeFrame.start === undefined || timeFrame.start < endDate) && (timeFrame.end === undefined || timeFrame.end > startDate)
    })

    for (let timeFrame of timeFrames) {
      if (!timeFrame.start) {
        timeFrame.start = startDate
      }
      if (!timeFrame.end) {
        timeFrame.end = endDate
      }
    }

    let orderedTimeFrames = GanttCalendar.$filter('orderBy')(timeFrames, (timeFrame) => {
      return -timeFrame.getDuration()
    })

    let k
    for (let oTimeFrame of orderedTimeFrames) {
      let tmpSolvedTimeFrames = solvedTimeFrames.slice()

      k = 0
      let dispatched = false
      let treated = false

      for (let sTimeFrame of solvedTimeFrames) {
        if (!treated) {
          if (!oTimeFrame.end && !oTimeFrame.start) {
            // timeFrame is infinite.
            tmpSolvedTimeFrames.splice(k, 0, oTimeFrame)
            treated = true
            dispatched = false
          } else if (oTimeFrame.end > sTimeFrame.start && oTimeFrame.start < sTimeFrame.end) {
            // timeFrame is included in this solvedTimeFrame.
            // solvedTimeFrame:|ssssssssssssssssssssssssssssssssss|
            //       timeFrame:          |tttttt|
            //          result:|sssssssss|tttttt|sssssssssssssssss|

            let newSolvedTimeFrame = sTimeFrame.clone()

            sTimeFrame.end = moment(oTimeFrame.start)
            newSolvedTimeFrame.start = moment(oTimeFrame.end)

            tmpSolvedTimeFrames.splice(k + 1, 0, oTimeFrame.clone(), newSolvedTimeFrame)
            treated = true
            dispatched = false
          } else if (!dispatched && oTimeFrame.start < sTimeFrame.end) {
            // timeFrame is dispatched on two solvedTimeFrame.
            // First part
            // solvedTimeFrame:|sssssssssssssssssssssssssssssssssss|s+1;s+1;s+1;s+1;s+1;s+1|
            //       timeFrame:                                |tttttt|
            //          result:|sssssssssssssssssssssssssssssss|tttttt|;s+1;s+1;s+1;s+1;s+1|

            sTimeFrame.end = moment(oTimeFrame.start)
            tmpSolvedTimeFrames.splice(k + 1, 0, oTimeFrame.clone())

            dispatched = true
          } else if (dispatched && oTimeFrame.end > sTimeFrame.start) {
            // timeFrame is dispatched on two solvedTimeFrame.
            // Second part

            sTimeFrame.start = moment(oTimeFrame.end)
            dispatched = false
            treated = true
          }
          k++
        }
      }

      solvedTimeFrames = tmpSolvedTimeFrames
    }

    solvedTimeFrames = GanttCalendar.$filter('filter')(solvedTimeFrames, (timeFrame) => {
      return !timeFrame.internal &&
        (timeFrame.start === undefined || timeFrame.start < endDate) &&
        (timeFrame.end === undefined || timeFrame.end > startDate)
    })

    return solvedTimeFrames

  }
}

export default function ($filter: IFilterService) {
  'ngInject'

  GanttCalendar.$filter = $filter
  return GanttCalendar
}